#include <etcd/Client.hpp>
#include <etcd/KeepAlive.hpp>
#include <etcd/Response.hpp>
#include <etcd/Watcher.hpp>
#include <etcd/Value.hpp>
#include <thread>
void callback(const etcd::Response& resp)
{
    if(resp.is_ok() == false)
    {
        std::cout << "收到一个错误的事件通知：" << resp.error_message() << std::endl;
        return;
    }
    for(const auto& ev : resp.events())
    {
        if(ev.event_type() == etcd::Event::EventType::PUT)
        {
            std::cout << "服务信息发生改变" << std::endl;
            std::cout << "当前的信息：" << ev.kv().key() << "-" << ev.kv().as_string() << std::endl;
            std::cout << "原来的信息：" << ev.prev_kv().key() << "-" << ev.prev_kv().as_string() << std::endl;
        }
        else if(ev.event_type() == etcd::Event::EventType::DELETE_)
        {
            std::cout << "服务信息下线被删除" << std::endl;
            std::cout << "当前的信息：" << ev.kv().key() << "-" << ev.kv().as_string() << std::endl;
            std::cout << "原来的信息：" << ev.prev_kv().key() << "-" << ev.prev_kv().as_string() << std::endl;
        }
    }
    
}
int main()
{
    std::string host = "http://127.0.0.1:2379";
    //实例化客户端对象
    etcd::Client client(host);
    auto resp = client.ls("/service").get();
    if(resp.is_ok() == false)
    {
        std::cout << "获取键值对失败: " << resp.error_message() << std::endl;
        return -1; 
    }
    int sz = resp.keys().size();
    for(int i = 0 ; i < sz ; ++i)
    {
        std::cout << resp.value(i).as_string() << "可以提供" << resp.key(i) << "服务"<< std::endl;
    }
    //实例化一个键值对事件监控对象
    auto watcher = etcd::Watcher(client,"/service",callback,true);
    watcher.Wait();
    return 0;
}